Yarn, fabric, plastic, etc.



Patented Aug. 26, .1930

GAMILLE DREYI'US, or nEw'Yonx, N. Y.

YARN, FABRIC, 'rnasrrc, arc.

No Drawing.

Heretofore it hasbeen impractical to use artificial yarns, fabrics, films, etc., made of nitrocellulose because of the high inflammability and explosibility of the nitrocellulose.

Altho it is true that yarns, fabrics, etc., are

made from nitrocellulose, they are not utilized in that form. They are subsequently denitrated and re-converted to cellulose. Because of these undesirable properties of nitrocellulose it has been im ossible to use nitrocellulose silk, etc., and t e use of celluloid and plastic compositions and films containing nitrocellulose Ifompounds has been restricted in a great degree. Thus they cannot 16 be used where relatively high temperatures are met with or where they would be subjected to electrical discharges, to friction, etc.

The applicant has now discovered that the various nitrocellulose compounds can be 2 treated to materiall lessen their inflammability without affecting appreciably their desirable properties. He has discovered that if a yarn, textile, film, fabric or plastic mass,

contalmng or consistin of nitrocellulose, is

r weighted the inflamma ility of the same is reatly reduced. In the case of yarns, films,

abrics and the like this weighting of the nitrocellulose, with the consequent reduction in inflammability, does away with the necessity of denitrating. In the case of celluloid and other plastics containi ng or consisting of nitrocellulose their field of usefulness is greatly increased.

As examples of the process which may be employed to 'weight nitrocellulose the followingmaybegiven: 9

The welghting may be accomplished by treating thenitrocellulose material with a solution of a salt or salts of tin, zinc, tungsten or aluminum, for instance, stannic chloride or any other suitable salt for weight in fixing the tin or other metal therein by a su sequent treatment with a solution of sodium hosphate or sodium silicate or both or any 0t er salt or salts suitable for fixing the metal salt or salts .used in the first treatment.

Or the nitrocellulose material may first be lled by treatment with a dilute solution of ormic or acetic acids or any other suitable gelling, softening or swelling agent-in sult- Application filed March 30, 1926. Serial No. 98,615.

able dilution or emulsion and then treated with a solution of stannic chloride, washed and the tin fixed therein by treating with a sodium phosphate or sodium silicate solution or both or any other salt or salts suitable for fixing the metal salt or salts used in the first treatment. The swelling, gelling or softening agent in suitable dilution or emulsion may also be incorporated during the treatment with the tin chloride, or the tin salt itself may be used in such a concentration and at such a temperature that it itself acts as a swelling agent. v

The film, yarn, fabric orother article containing nitrocellulose can also be weighted by treatment with tannic acid alone or by a treatment with tannic acid followed by a treatment with tartar emetic or by a tannic acid treatment followed by a treatment with a solution of stannicchloride. Any of the usual methods used for weighting silk or artificial silk, which are suitable, also may be employed to weight the nitrocellulose.

The weighting of nitrocellulose fibres or fabrics removes not only the necessity of denitrating the same in order to make them usable but it also improves the properties of such fabrics or articles in many other respects. Thus a circular knit fabric of nitrocellulose which fabric h'as been weighted will have its tendency to ladder very greatly diminished-the greater the percentage of weighting the less thetendencyto ladder. In a-similar manner a'weighted fabric entirely of nitrocellulose or a weighted mixed fabric containing nitrocellulose fibres will lose the tendency to slip or shift due to the fact that the weighted fibres are enlarged and form afirmer contact with the adjacent fibres. The melting or rather the decomposition point of fabrics containing weighted nitrocellulose israised as a result of the weighting and the inflammability of the nitrocellulose is lowered making it evenpossible for the fabric to be ironed. It has also been discovered that the tendency of nitrocellulose fabrics and yarns to become delustred when dyed at elevated temperatures is appreciably lessened when such a fabric or am has been previously weighted. Nitrocel ulose articles which have been weighted show another pendent of any particular weighting agent marked. improvement over the unweighted nitrocellulose articles. The latter are very difiicultly dyed whereas the former are very easily dyed when subjected to a dyeing operation with various dyestufi s.

The improved properties of the nitrocellulose products as above referred to are indeor agents and of the process employed in the application of the-weighting agent to the nitrocellulose material.

'The above examples are merely illustrative and should not be construed as limitative. limited only by the scope of the appended claims. The term fabric where used in the claims is to be construed as including textile or other finished articles such as garments, stockings, etc., and fabrics made from weighted nitrocellulose yarns.

What I claim and desire to secure by Letters Patent is:

1. An improved product comprising .a nitrocellulose compound which is weighted with an insoluble metallic salt.

2. An improved product comprising a nitrocellulose compound which is weighted with an insoluble tin salt.

3. An improved product comprising a nitrocellulose compound weighted with a tin salt, fixed therein as tin phosphate.

4. A new and improved fabric containing,

nitrocellulose weighted with an insoluble metallic salt.

5. A new and improved fabric containing nitrocellulose fibres weighted with an insoluble tin salt.

6. A new and improved fabric containing nitrocellulose fibres weighted with a tin salt,

which is present therein as tin phosphate.

7. A non-laddering or difficultly laddering circular knit fabric which contains nitrocellulose fibres weighted with an insoluble metallic salt. I

8. A non-laddering or diflicultly laddering circular knit fabric containingnitrocellulose fibres weighted with tin phosphate.

9. A non-slipping or diflicultly slip g mixed fabric containing nitrocellulose liifi ea with an insoluble metallic salt thereon.-

.10. Anon-slipping or diflicultly slip ing mixed fabric containing nitrocellulose bres having tin phosphate thereon. O

11. A plastic composition containing nitrocefiulose weighted with an insoluble metallic sa scribed my name.

CAMILLE 'DREYFU'S.

The invention should be considered as In testimony whereof, I have hereunto sub- I 

